Initial commit: notification-elements-demo app

Interactive Angular 19 demo for @sda/notification-elements-ui with
6 sections: Bell & Feed, Notification Center, Inbox, Comments &
Threads, Mention Input, and Full-Featured layout. Includes mock
data, dark mode toggle, and real-time event log.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

node_modules/@babel/traverse/README.md

@@ -0,0 +1,19 @@
+# @babel/traverse
+
+> The Babel Traverse module maintains the overall tree state, and is responsible for replacing, removing, and adding nodes
+
+See our website [@babel/traverse](https://babeljs.io/docs/babel-traverse) for more information or the [issues](https://github.com/babel/babel/issues?utf8=%E2%9C%93&q=is%3Aissue+label%3A%22pkg%3A%20traverse%22+is%3Aopen) associated with this package.
+
+## Install
+
+Using npm:
+
+```sh
+npm install --save-dev @babel/traverse
+```
+
+or using yarn:
+
+```sh
+yarn add @babel/traverse --dev
+```